套接字上下文选项

套接字上下文选项列表

说明

套接字上下文选项可用于所有工作在套接字上的封装协议，像tcp,http和ftp.

可选项

$bindto

用户PHP访问网络的指定的IP地址（IPv4或IPv6其中的一个）和/或端口号，这个语法是ip:port. Setting the IP or the port to0will let the system choose the IP and/or port.

Note:

As FTP creates two socket connections during normal operation, the port number cannot be specified using this option.

$backlog

Used to limit the number of outstanding connections in the socket's listen queue.

Note:

This is only applicable to stream_socket_server().

更新日志

范例

Example #1 Basic$bindtousage example

<?php
// connect to the internet using the '192.168.0.100' IP
$opts = array(
    'socket' => array(
        'bindto' => '192.168.0.100:0',
    ),
);
// connect to the internet using the '192.168.0.100' IP and port '7000'
$opts = array(
    'socket' => array(
        'bindto' => '192.168.0.100:7000',
    ),
);
// connect to the internet using port '7000'
$opts = array(
    'socket' => array(
        'bindto' => '0:7000',
    ),
);
// create the context...
$context = stream_context_create($opts);
// ...and use it to fetch the data
echo file_get_contents('http://www.example.com', false, $context);
?>

You can set "bindto" to "0:0" to force use IPv4 instead of IPv6. And probably "[0]:0" to force use IPv6, thou this I couldn't test.

The right way for forcing IPv6 is 'bindto' => '[::]:0'